The yellow and purple of the VSS run to the 7730's inputs and no where else.
4000K PPM ECM output runs to the green buffer input
Your pinks are good. The wire size is no problem.
Yellow output of the buffer to C203 G
Nothing connected to C203 R
So let me ask. What transmission are you running? If it is a Fiero MT or Fiero AT with the Fiero VSS you do not need the speedo buffer, nor do you need to run the VSS signal through the ECM. Instead you can run it to both the inputs of the ECM and have it T spliced so it also runs to C203. This is how Darth is explaining it.
If you have a transmission that has a 24000 PPM VSS then you do need to run it through the ECM, and you also need to have the ECM programmed for the correct divisor (6x) to the 4000 PPM output.
You can run thestock Fiero VSS output to the 7730's VSS input, and use the 4000 PPM ECM output (along with the speedo bufer) and program the ECM for the correct divisor (1x) to run the speedo but there is no gain by doing so.
The VSS signal needs to be connected to the ECM for the ECM to operate the engine correctly.
The VSS signal needs to either be T spliced (stock Fiero VSS) to the VSS, or fed off of the 4000 PPM ECM output to work correctly.
[This message has been edited by phonedawgz (edited 05-24-2014).]